M54HC123_04 Datasheet, PDF (1/11 Pages) STMicroelectronics – RAD-HARD DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

M54HC123
RAD-HARD DUAL
RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
s HIGH SPEED: t_PD = 23 ns (TYP.) at V_CC = 6V
s LOW POWER DISSIPATION:
STAND BY STATE:
I_CC=4µA (MAX.) at T_A=25°C
ACTIVE STATE:
I_CC=200µA (MAX.) at V_CC = 5V
s HIGH NOISE IMMUNITY:
V_NIH = V_NIL = 28% V_CC (MIN.)
s SYMMETRICAL OUTPUT IMPEDANCE:
|I_OH| = I_OL = 4mA (MIN)
s BALANCED PROPAGATION DELAYS:
t_PLH ≅ t_PHL
s WIDE OPERATING VOLTAGE RANGE:
V_CC (OPR) = 2V to 6V
s WIDE OUTPUT PULSE WIDTH RANGE:
t_WOUT = 120 ns ~ 60 s OVER AT V_CC = 4.5 V
s PIN AND FUNCTION COMPATIBLE WITH
54 SERIES 123
s SPACE GRADE-1: ESA SCC QUALIFIED
s 50 krad QUALIFIED, 100 krad AVAILABLE ON
REQUEST
s NO SEL UNDER HIGH LET HEAVY IONS
IRRADIATION
s DEVICE FULLY COMPLIANT WITH
SCC-9207-006
DESCRIPTION
The M54HC123 is an high speed CMOS
MONOSTABLE MULTIVIBRATOR fabricated with
silicon gate C²MOS technology.
There are two trigger inputs, A INPUT (negative
edge) and B INPUT (positive edge). These inputs
PIN CONNECTION
DILC-16
FPC-16
ORDER CODES
PACKAGE
FM
DILC
FPC
M54HC123D
M54HC123K
EM
M54HC123D1
M54HC123K1
are valid for slow rising/falling signals, (tr=tf=l sec).
The device may also be triggered by using the
CLR input (positive-edge) because of the
Schmitt-trigger input; after triggering the output
maintains the MONOSTABLE state for the time
period determined by the external resistor R_X and
capacitor C_X. When C_X > 10nF and R_X > 10KΩ,
the output pulse width value is approximately
given by the formula: t_W(OUT) = K · C_x · R_x.
(K ≅ 0.45).
Taking CLR low breaks this MONOSTABLE
STATE. If the next trigger pulse occurs during the
MONOSTABLE period it makes the
MONOSTABLE period longer. Limit for values of
C_x and R_x : C_x : NO LIMIT
R_x : V_CC < 3.0V 5KΩ to 1MΩ
V_CC > 3.0V 1KΩ to 1MΩ
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
March 2004
1/11